Pipe coating apparatus



2, 1954 Rkms 2,670,991

PIPE COATING APPARATUS Filed Sept. 20, 1951 FIG. I.

' INVENTO'R 0/6 i W WMA@ ATTORNEY Patented Mar. 2, 1954 UNITED STATES PATENT OFFICE PIPE COATING APPARATUS Albert G. Perkins, Grand Island, N. Y. Application September 20, 1951, Serial No. 247,539

This invention relates generally to apparatus for applying a protective coating of mortar or like material to the inner walls of steel pipe walls, conduits and the like, but more particularly-to certain new and useful improvements provided in the dispensing end of the apparatus for discharging the mortar therefrom in a clean fashion and prevent plugging of its ports.

It has for its primary object to provide simple, reliable and efiicient means in the dispensin end of the machine for effecting the constant and clean removal of the mortar from the discharge or ported end of the feed conduit into the revolving dispensing head, and thereby prevent setting of the mortar and plugging of the discharge ports.

Other features of the invention reside in the construction and arrangement of parts hereinafter described and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a side elevaton of the pipe coating apparatus in an operating position within a pipe line. Figure 2 is an enlarged fragmentary longitudinal section of the feed conduit and associated parts embodying my improvements. Figure 3 is a fragmentary cross section taken on line 33,

Figure 2. Figure 4 is an enlarged fragmentary longitudinal section taken in the plane of line 4-4, Figure 3.

Similar characters of reference indicate corresponding parts throughout the several views.

The pipe coating apparatus to which my improvements are directed, is primarily employed for coating the walls of steel pipe lines with a protective coating of a plastic-like material or mortar, such as concrete, and consists generally of a carriage which is adapted to be propelledi through the pipe line to be coated, a hopper for;

the coating material mounted thereon, a dis-,;

pensing head for receiving the material from the hopper and directing it against the pipe wall, and means for conveying the coating material from the hopper to the dispensing head.

Referring to the drawings, l indicates a section of the steel pipe and H indicates generally the carriage of the apparatus which is adapted to be propelled therethrough, while [2 indicates the feed hopper for the coating material and I3 indicates a revolving dispensing head for directin the material onto the interior of the pipe wall; Connecting the feed hopper with the dispensing head is a feed conduit is in which a conveyor screw I5 is arranged for propelling the material in continuous fashion to the dispensing head, the

e Claims. (c1. 299 sa) 2 latter being driven and revolvably mounted on such conduit in any suitable manner.

The discharge or dispensing end of the conduit [4 is closed by a head plate It and inwardly thereof is provided with an annular row of discharge ports ll through which the coating material flows into the revolving path of the dispensing head If. Applied to the inner face of the head plate [6, which forms a bearing for the outer end of the conveyor screw shaft, is an axially-disposed, substantially conical-shaped spreader or deflector I8, and applied to such shaft in extending correlation with such deflector is a conical-sleeve [9 which partially overlaps or telescopes the latter and forms a seal or cover for the shaft-bearing. The primary purpose of these conical elements [8, I9 is to direct and uniformly spread or force the mortar outwardly through the discharge ports to thereby effect a uniform distribution of the mortar throughout the head and assure a like distribution of the mortar about the pipe wall. a

For the purpose of keeping the ported discharge end of the feed conduit I 4 as clean as possible from mortar and prevent it from setting and causing plugging of the ports, the blade 20 of the conveyor screw I5 extends into the plane of the ports and terminates in substantially abutting relation to the inner face of the head plate [6 and encircles the conical deflector I8; at its inner edge to scrape the mortar therefrom. By this construction and arrangement of parts, the mortar is propelled to the end of the conduit by the feed screw with the terminal end of its wormblade extending across or spanning the discharge ports in the conduit and in intimate scraping relation to the inner face of the head plate and its conical deflector to not only keep the mortar in motion outwardly through the ports but to maintain such surfaces and adjoining corners clean of mortar and prevent any building up and setting of the mortar in the discharge zone and consequently eliminate plugging of the discharge ports.

While a single worm feed screw has been shown in the drawings it will be understood that a double worm feed screw could be equally used.

I claim as my invention:

1. An apparatus for lining pipe walls, comprising a feed conduit adapted for communication at one end with a source of coating material and having radial discharge ports at its opposite end, a revolving feed means in said conduit for forcing the material therethrough toward its discharge ports, and a revolving dispensing head in operative relation to said ports for receiving the material therefrom and directin it onto the pipe wall, the ported end of said conduit being closed and having an axially-disposed spreader thereon in fixed relation to said feed means and extending into the zone of the discharge ports for deflecting and forcing the material outwardly therethrough and the feed means including a portion extending into and spanning the ported zone of the conduit in scraping relation thereto and other portions in scraping relation to the closed end of the conduit and in encircling scraping relation to said spreader.

2. An apparatus for lining pipe walls, comprising a feed conduit adapted for communication at one end with a source of coating material and having radial discharge ports at its opposite end, the conduit being closed at its ported end and having a fixed axially-disposed spreader of substantially conical shape extending into the same in the plane of said discharge ports, a revolving sp nsin head in operative relation to said ports to receive the material therefrom and direct it against the pipe wall, and a feed screw in said conduit extending to the closed end thereof in the zone of the discharge ports and having its blade in opposed edgewise relation to the ported zoneof the conduit, to such closed conduit end and to said conical spreader for preventing the building up and setting of the coating material in the discharge zone of the conduit.

3. An apparatus for lining pipe walls, comprising a feed conduit adapted for communication at one end with a source of coating material and: losedat ts pposite end with radial dis- .charg ports adjacent such closed en a oni alshaped, material-deflecting spreader extending axially from the closed end of said conduit into the same iii-the zone of said discharge ports, and a revolving feed screw in said conduit withit blade extending to the closed end thereof in encircling scraping relation to said spreader and in like correlation at its peripheral and radial edge respectively, with the ported zone oi'the conduit and its closed end.

4. An apparatus for lining pipe walls, comrising a feed conduit adapted for communication at one end with asouree of coating material and closed at its opposite end, with radial discharge ports adjacent such closed end, a conical-shaped, material-deflecting spreader: 3X-

tending axially from the closed end of said conduit into the same in the zone of said discharge ports, a revolving feed screw in said conduit with.

its blade spanning the discharge zone of the conduit and terminating at its radial edge in scraping relation to the closed end thereof and in encircling scraping relation at its inner periphery to said spreader, said feed screw being journaled at its discharge end in said spreader andhaving a conical sleeve thereon in partia overlying relation to the opposing end of such spreader.

5. An apparatus for lining pipe walls, comprising a feed conduit adapted for communication at one end with a source of coating material and having radial discharge ports at its opposite end, a feed means in said conduit for forcing the material therethrough toward its discharge ports, and "a revolving dispensing head in operative relation to said ports for receiving the material therefrom and directing it onto the pipe wall, the ported end of said conduit being closed and having a fixed axially-disposed member thereon in correlation to said feed means to force the material outwardlyv through said ports and the feed means including a spirally-bladed portion extending into and spanning the ported zone of the conduit in correlation thereto to remove the material between such ports and in scraping relation at its radial end to the closed end of, the conduit.

6. An apparatus for lining pipe walls, comprising a feed conduit adapted for communication at one end with a source of coating material and closed at its opposite end with radial discharge ports adjacent such closed end, and a revolving feed screw in said conduit with its-blade extending into and spanning the discharge zone of the conduit to remove thematerial from between the discharge ports and with-its radial end in scraping relation to the closed end of the conduit.

ALBERT G. PERKINS.

References Cited in the file Of this patent UNITED STATES PATENTS 

